Can the triggering logic of the SPG circuit be reversed? That is, can the circuit be made to trigger when light shines on the detector instead of vice versa?
Yes, this is the way our light-activated trigger circuits work. If you have an SPG1, first remove the 10-kΩ potentiometer and the phototransistor from the circuit. Then connect the phototransistor where the 10-kΩ pot used to be. Connect a 100-kΩ pot in the position where the phototransistor used to be.
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